| 摘要 |
PROBLEM TO BE SOLVED: To provide a coil for digital amplifier having high space efficiency and small leakage flux. SOLUTION: Two tabular cores 1 having E-shaped cross sections are combined to form a vertically long box-shaped core 2. An air-core coil 3 is inserted into the box-shaped core 2 with the bottom thereof being combined to a resin base 4, thus forming an internal magnet type coil that confines magnetic line of force. The matching surfaces of the tabular cores 1 are formed with P-shaped winding grooves (a) that face each other. The air-core coil 3 is inserted into a circular core 5 surrounded by a circular groove (b) that corresponds to the head of the P-shaped winding groove, thus a horizontal internal magnetic coil is vertically disposed. The air-core coil 3 is a solenoid coil comprised of a winding itself without a bobbin or a core which is wound with a coating copper wire of urethane enamel or the like in a tubular manner. The start and end of the winding extend toward the tangential direction just the way they are to form a lead 6. The box type core 2 is assembled by inserting the separately wound air-coil core 3 into the circular core 5 of one tabular core 1, and then by combining the other tabular core 1 such that the cores face each other. COPYRIGHT: (C)2007,JPO&INPIT
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